On friday I'm gonna hang out with two friends. What are the chances that one of them is a guy if:
A: one is a girl
B: one is a girl born in december
You may assume the following things:
- Female and male friends are just as likely in general
- All months have the same number of days
Zero chance
May i ask how to get this answer?
How can your friend be a guy? The problem states that they are girls.
I think it is talking about two different scenarios.
YW4573
This is a puzzle created by user on the site, you can't just ask for help in order to get the prize with ease.
To answer the question, we need to consider all the possible scenarios and determine the chance that one of the friends is a guy based on the given conditions.
A: If one friend is a girl, there are two cases to consider:
1. The other friend can be a guy, resulting in one guy and one girl.
2. The other friend can also be a girl, resulting in two girls.
In scenario 1, the chances of having a guy friend are 1 out of 2, or a probability of 1/2. In scenario 2, the probability of having a guy friend is 0 since both friends are girls.
Therefore, the overall chance of having one of the friends be a guy when one is a girl is 1/2.
B: If one friend is a girl born in December, we need to consider the additional condition. Since all months have the same number of days, being born in any specific month does not affect the probability of having a guy friend. The probability remains the same as in scenario A.
Therefore, the chance of having one of the friends be a guy when one is a girl born in December is also 1/2.